<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>用户登录</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f5f5f5;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        .login-container {
            background: white;
            padding: 2rem;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0,0,0,0.1);
            width: 300px;
        }
        h1 {
            text-align: center;
            color: #333;
            margin-bottom: 1.5rem;
        }
        .form-group {
            margin-bottom: 1rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            color: #555;
        }
        input {
            width: 100%;
            padding: 0.5rem;
            border: 1px solid #ddd;
            border-radius: 4px;
            box-sizing: border-box;
        }
        button {
            width: 100%;
            padding: 0.75rem;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 1rem;
        }
        button:hover {
            background-color: #45a049;
        }
        .error {
            color: red;
            margin-top: 1rem;
            text-align: center;
        }
    </style>
</head>
<body>
    <div class="login-container">
        <h1>用户登录</h1>
        <form id="loginForm">
            <div class="form-group">
                <label for="username">用户名</label>
                <input type="text" id="username" name="username" required>
            </div>
            <div class="form-group">
                <label for="password">密码</label>
                <input type="password" id="password" name="password" required>
            </div>
            <button type="submit">登录</button>
        </form>
        <div id="errorMessage" class="error"></div>
    </div>
    <!-- Script will be automatically injected by webpack -->
</body>
</html>